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# show your accquaintance with entropy and entropy change in isolated system?

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- 1 decade agoFavorite Answer
The concept of thermodynamic entropy is central to the second law of thermodynamics, which deals with physical processes and whether they occur spontaneously. In a general sense the second law says that temperature differences between systems in contact with each other tend to even out and that work can be obtained from these non-equilibrium differences, but that loss of heat occurs, in the form of entropy, when work is done. The concept of energy is central to the first law of thermodynamics, which deals with the conservation of energy and under which the loss in heat will result in an increase in the internal energy of the thermodynamic system. Thermodynamic entropy provides a comparative measure of the amount of this increase in internal energy at a given temperature. A simple and more concrete visualisation of the second law is that energy of all types changes from being localized to becoming dispersed or spread out, if it is not hindered from doing so. Entropy change is the quantitative measure of that kind of a spontaneous process: how much energy has flowed or how widely it has become spread out at a specific temperature.

In thermodynamics, entropy is one of the three basic thermodynamic potentials U (internal energy), S (entropy) and F (Helmholtz free energy).

Entropy has been developed to describe any of several phenomena, depending on the field and the context in which it is being used. Information entropy takes the mathematical concepts of statistical thermodynamics into areas of probability theory unconnected with heat and energy

Source(s): wikipedia : An Overview of Entropy